Rebeca Sanchez-Lopez appeals her 70-month sentence for conspiracy to import 500 grams or more of cocaine into the United States, importation of 500 grams or more of cocaine into the United States, conspiracy to possess with intent to distribute 500 grams or more of cocaine, and possession with intent to distribute 500 grams or more of cocaine.

Sanchez-Lopez argues, for the first time on appeal, that the district court’s decision to deny her a minor-role downward adjustment, based on its finding that she had transported cocaine into the United States on five to ten occasions, was not supported by the record and thus was unreasonable in light of the Supreme Court’s ruling in United States v. Booker, — U.S. -, 125 S.Ct. 738, 160 L.Ed.2d 621 (2005). As Sanchez-Lopez did not raise a claim under Booker below, we review for plain error. United States v. Mares, 402 F.3d 511, 520 (5th Cir.), petition for cert. filed (U.S. Mar. 31, 2005) (No. 04-9517). In Booker, the Supreme Court ruled that, “[a]ny fact (other than a prior conviction) which is necessary to support a sentence exceeding the maximum authorized by the facts established by a plea of guilty or a jury verdict must be admitted by the defendant or proved to a jury beyond a reasonable doubt.” Booker, 125 S.Ct. at 756. We “read Booker to apply only to sentencing adjustments based on judge-found facts which increase a defendant’s *694 sentence, not to mitigating adjustments.” United States v. De Jesus-Batres, 410 F.3d 154, 166 n. 2 (5th Cir. 2005). Thus, Booker does not apply to Sanchez-Lopez’s assertion of error and the district court did not commit error, plain or otherwise.

To the extent that Sanchez-Lopez’s argument may be perceived as a preserved objection to the district court’s denial of a minor-role downward adjustment, this court’s review is for clear error. De Jesus-Batres, 410 F.3d at 162-163. Sanchez-Lopez was convicted and sentenced based solely on the activity in which she was involved and she has not shown that she was substantially less culpable than the average participant. Thus, the district court did not clearly err by denying Sanchez-Lopez a minor-role downward adjustment. See United States v. Garcia, 242 F.3d 593, 598 (5th Cir. 2001); United States v. Atando, 60 F.3d 196, 199 (5th Cir. 1995).

AFFIRMED.